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Old 12-09-2013, 10:49 PM   #1
Superaccord93
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H22/a6 IM unique porting idea

I'm interested in porting my hybrid intake manifold and I just want opinions on the way I plan to do this. I only say unique because I havent read anyone doing it this way though I'm sure it's been done. Sorry I don't have pics yet but I will soon.

I was going to cutout the ports on the bottom of the h22 plenum to increase plenum volume. Double stack the Iabs, keeping the butterfly's on the bottom and the gutted iab on top. The one on top I was going to port out the circular holes where the butterfly's used to be extending the plenum volume directly to the stock butter fly length in the runner keeping the high end when the iabs kick in around 4,000rpm. Shorter runners more high end am I right?

The other squared off holes will stay and be port matched to make the initial runners longer making my torque slightly better for low end. This is just an idea I came up with after intense research, to get the best of both worlds tq and hp gains. This would and be tuned on a chipped p06 ecu after I get my delta 272 regrind.

Btw it'll all be polished and port matched to perfection also including half the runners and the head to be port matched as well intake and exhaust.
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Old 12-09-2013, 11:33 PM   #2
GhostAccord
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I'm not sure if I understand what you are doing. How will your runners be variable length if you gut the bottom half? That will make your runners one length it doesn't matter if you keep the butterflies or not if you gut the bottom end... Other than it will allow for a larger volume of air into the gutted bottom half. The actual length of the runners between the throttle body and the back of the intake valves will still be the same length.

Most people who gut the bottom half delete the butterflies and gut the spacers as well. The gutted intakes are not the best intake option for a naturally aspirated engine. More for a boosted build.
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Old 12-10-2013, 12:08 PM   #3
Superaccord93
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I want the larger volume of air for when the butterfly's kick open and the longer runners from the stacked iabs (squared off holes) for before the butterfly's kick in. f/I isn't in the cards yet but I understand what you're saying I might dyno the difference between the two to get actual numbers and see what's good.
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Old 12-10-2013, 12:33 PM   #4
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OK I see what your saying now... I had to read it a couple times. You are leaving the bottom half of the intake manifold with all 8 runners.

I miss read your comment about gutting the bottom of the H22 plenum, I read it as you were going to be gutting the lower intake manifold.
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Old 12-10-2013, 01:01 PM   #5
Darkcloud
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Its been done already, an cali member has done it as well as a glorida member. only difference between yours and theirs,is that you want to keep the IAB and to be honest even ig you do with the porting it wont really help.

But do it if you want.
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Old 12-15-2013, 11:32 AM   #6
Superaccord93
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[quote=Superaccord93;3181552]So I got the plenum and extra iab off eBay today. Said h22a4 on the listing. Turns out the runners are h22a4 and the plenum is off an f22b. The guy had no idea what he had and there was only one pic. Typical eBay right. On the bright side the f22b plenum inlets larger than the h22s. But now the tb I have already port and polished doesn't line up with the bolts and the opening by the butterfly plate is way smaller than the opening on the f22b tb. This will prolong my experimenting with the different intake manifolds.
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